What is the scientific notation for 1,200,000,000

Can someone me and plz do the problem

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20